Rotary grinder.



OFFICE THOMAS A. PANYARD, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO LUTHER BROTHERS COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

ROTARY GRINDER. l

. adapted to be temporarily attached to a bench or table by a clamping screw, and it pertains more especially among other things, first to the construction orp the gear supporting frame, cast integrally from a single piece of metal including the journal bearings of the respective gears, clamping arms, and a screw supporting bracket. Second to the relative arrangement oi the gear supporting journals and clamping arms by which the main driving shaft, to which the crank is attached, is

located below the clamping arms, and whereby the driving mechanism is brought in close proximity to the supporting table or bench and the machine thereby more rigidly supported and loss liable to become loose when used. And third to the device for adjusting the driving mechanism to take up the slack caused by wear in the sprocket chain or driving gears, and to adjust the lower pinion near to or farther from the main drivnig gear.

It also pertains further to the mechanism for changing the adjustment of the tool rest relatively to the abrading wheel.

The construction of my invention is eX- plained by reference to the accompanying drawings in which,-

Eigure l is a side view thereof as it appears supported from the edge of a table. Fig. 2 is a front view oi the device shown in Fig. l. Fig. 3 represents the main supporting frame which is formed integrally from a single piece of metal. Fig. 4 is a top vie" of the tool rest shown in Fig. l. 5 is a transverse section oi the frame drawn on line X-X of Fig. 3.

Like parts are identified by the same reference characters throughout the several views.

l represents the abrading wheel formed of emery or any other suitable material adapted to the purpose.

2 is an operating handle by which motion is communicated to the grinder by the manual act of the user. Motion is communicated Specification of Letters Patent.

Application filed March 7, 1908.

Patented Feb. 9, 1809.

Serial No. 419,613.

from the handle 2 to the abrading wheel l through the crank arm 3, gear wheel 4, pinion 5, sprocket wheel 6, sprocket chain 7, pinion or sprocket wheel 8 and wheel supporting shaft 9. It will be understood that both the abrading wheel l and wheel 8 are rigidly aflixed upon the supporting shaft 9. It is a well known fact that owing to the high speed usually employed for driving abrading wheels of the class described the sprocket chain becomes worn and loose upon its' supporting wheels, whereby it is liable to become disengaged from such supporting wheels. viWith a view of taking up the slack and overcoming this objection, l have provided an elongated slot ll for the pinion supporting shaft l() which slot permits of the lateral adjustment of said shaft nearer to or furthe" from the wheel supporting shaft 9 upon .vhioh the sprocket wheel S is supported. The shaft I() is provided with a shoulder l2 against which the clamping washer 13 is adapted to bear and also with a washer i4 against which the clamping nut l5 is adapted to bear. removed, the shaft IO is inserted through the slot li when the washer 14 is put in place and the nut 15 is turned down agaist it when said washers 13 and 14 are firmly clamped against the respective sides of the shaft supporting lug 16, whereby said shaft l0 is rigidly secured in place. Thus it is obvious that when the sprocket chain 7 becomes slack from wear, expansion or toher cause, such slack may be readily taken up by loosening the nut l5 on the shaft IO and moving said shaft and sprocket wheel 6 downwardly and away from the shaft 9 until the chain 7 is brought to the required tension when the shaft l0 is rigidly clamped at such point of adjustment. The slot 1l is also made of slightly greater width than the shaft l0, whereby it may be adjusted slightly toward or from the wheel supporting shaft 17 as may be necessary to adjust the pinion 5 to smoothly and nicely mesh with the teeth ol' the driving wheel 4. It will of course be understood that both of said adjustments are accomplished by first releasing said nut 15 slightly upon the shaft l0. When said shaft is adjusted and at the desired point to both take up the slack of the chain 7 and bring the pinion 5 in its proper relative position to the periphery of the driving wheel 4. The several sprocket wheels, gears, abrading rifhe nut l5 and washer 14 being o Wheel and driving gears are all supported from a single traine 18, and said traine i8 is -provided with clamping arins 1.9 clamping screw 20 and screw supporting lbracket 2l hy which said irarne and the parts `supported ther'eon are secured to a table 22 in the orc inary manner.

23 is a tool rest which is adg'ustahly supported 'from a lug 24 which lug is lorined integrally With the frame 18 by the clamping screws 25, arin 28, clamping screwv 27 and clamping nut 28. The arrn 26 is pi 'll erably provided With an elongated slot El) which perniits oi the vertical adjustment oi' said arin, While the toolL rest 23 is provided with an elongated slot 30 which permits oi the lateral adjustment of said rest nearer to or farther frein the surface ol the abra/ling Wheel. Thus it is oovious that by loosening the clamping screws 25, and Z7, said rest niay he adjusted either nearer to or farther troni the surface ol the ahrading rv'neel,

above or below the horizontal centers o'i the Wheel supporting shal't a. d at various angles to the surface of the Wheel as niay he 'l'ound inost convenient when supporting a tool thereon as it is being ground.

Attention is called to the tact that the upl per end o'l'l the machine supportinLr inclined forwardly at an an to the levier supporting portion, Whereoy a Wheel is brought in iront ol' the anisni and in close proximity ing bench or table whereby tvr'o objects are attained. li'irst, the dust duced by grinding is less liaele to drop thrown upon the driving ineclianisir driving inechanisni is also thereby ln' nearer tothe supporting table.

Having thus described niy inventionL `hat I claiin as new and desire to secure Letters Patent is,

l. ln a rotary grinder oi the class described an integrally formed gear supporting l'raine,

and `ctyveen it and the shalt 1Bearings o'll the driven gears, a pair oi sprocket Wheels and Wheel supporting sha-'lts supported ironi said lranie, the shaft ol' the larger sprocket WheelV being adapted to he adjusted both longitu-` dinally and transversely in a supporting slot 'l'orined in said iii-aine, a sprocket chain op erating upon said sprocket Wheels and ineans i'or coinrnunicating inotion to said sprocket Wheels and chain and i'rorn said sprocket Wheels and chain to anahrading wheel and ineens i'or rigidly securing the shai't ol' the larger sprocket Wheel at various points ol adjustment in said slots, bot-h in relation to the shal't ol the other sprocket vfheel and the niain driving Wheel.

'2. ln a rotary grinder oll the class described the combination ol' a pair oiI sprocket Wheels and v-,fheel supporting shafts, a rocket chain operating upon said sprocket wheels, a driving Wheel, means 'l'or manually operating said driving wheel, rneans vl'or coininunicating inotion 'l'rorn said driving wheel to the larger of said sprocket Wheels, means Vfor changing the adjustment oi said sprocket Wheel to each other to take up slack in said sprocket chain, and ineens for changing the adjustment ol' the larger o'l' said sprocket wheels relatively to said driving Wheel to take up We? between said driving wheel and the pinion oi' said sprocket Wheel, substantially as and Vl'or the purpose specified.

ln testiniony whereof l ailix iny signature in the presence olI two Witnesses.

THOMAS A, TPANYARD.

Tillitnesses das. B. EnwiN, O. R. ERWIN. 

